Nitrogen Organic Compound Containing Patents (Class 252/394)
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Patent number: 6464763Abstract: A composition for use in forming a dry film coating on metal surfaces to at least temporarily protect the surfaces from oxidation comprises at least 20% by weight of a combination of at least one saturated linear carboxylic monoacid with at least one unsaturated linear carboxylic monoacid. The monoacids are in the form of alkaline, alkaline-earth or amine salts. The carbon chain of each acid comprises an uneven number of carbon atoms varying from 5 to 21. At least 0.5% by weight of a triazole derivative can be added to enhance the anti-corrosion effect. The composition is water-soluble and the dry protective film can be formed by diluting the composition in water, applying the diluted composition to a metal surface and then air drying it.Type: GrantFiled: May 22, 2001Date of Patent: October 15, 2002Assignee: Elf Antar FranceInventors: Pierre Steinmetz, Jacques Cotteret, Corinne Chauvineau
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Patent number: 6464899Abstract: Compositions and methods for inhibiting corrosion of metallic surfaces are disclosed. The corrosion-inhibiting compositions are cost efficient, easy to use and can be conveniently removed or replaced. The corrosion-inhibiting compositions include a putty-like base material that is pliable and has sufficient tackiness to be securely affixed to surfaces. Corrosion inhibiting compounds are combined with the base material. These compositions provide a vapor phase corrosion inhibitor for both direct and indirect contact with metallic objects.Type: GrantFiled: June 2, 2000Date of Patent: October 15, 2002Assignee: Henkel Loctite CorporationInventors: Hans E. Haas, Matthew P. Burdzy
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Patent number: 6464901Abstract: Non-halogen substituted, nitrogen containing, aromatic compounds are disclosed which are effective copper corrosion inhibitors in aqueous systems being treated with a halogen biocide. The materials of the present invention exhibit copper corrosion inhibition comparable to tolyltriazole in the absence of halogen, copper corrosion rates of less than about 2.5 mills per year in aqueous systems where halogen is present; and do not exhibit a detrimental effect on halogen demand in an aqueous system being treated.Type: GrantFiled: May 5, 2000Date of Patent: October 15, 2002Inventor: Longchun Cheng
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Patent number: 6458320Abstract: This invention relates to a galvanized metal, typically steel, corrosion inhibitor concentrate comprising (a) an amine salt of a fatty acid or an amine salt of a derivative of a fatty acid, (b) preferably a salt of a non polymeric aromatic acid, and (c) preferably a nonionic or anionic surfactant, and water. The invention also relates to a process for inhibiting corrosion and/or stripping of galvanized steel subjected to acidic conditions, e.g. an amine citrate or citric acid cleaning solution.Type: GrantFiled: April 5, 1999Date of Patent: October 1, 2002Assignee: Ashland Inc.Inventors: Bruce L. Libutti, Joseph Mihelic
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Patent number: 6432355Abstract: Described herein is a process of corrosion inhibition of a steel pipeline during transport of water and gas, or water and an oil, or mixtures thereof, therethrough, including introducing a copolymer of vinyl caprolactam and vinylpyridine into said pipeline.Type: GrantFiled: October 12, 1999Date of Patent: August 13, 2002Assignee: ISP Investments Inc.Inventors: Kirill N. Bakeev, Jui-Chang Chuang, Thomas Winkler, Michael A. Drzewinski, David E. Graham
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Patent number: 6419857Abstract: A novel composition of thiazolidines of the following formula and a method to prepare the same are disclosed. The method involves reacting a dihydrothiazole with a mixture comprising formic acid and an aldehyde. These new thiazolidines are useful as corrosion inhibitors.Type: GrantFiled: December 6, 1999Date of Patent: July 16, 2002Assignee: Baker Hughes IncorporatedInventors: Bernardus Antonius Maria Oude Alink, Benjamin T. Outlaw
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Publication number: 20020063241Abstract: Drag reducers having the formula: 1Type: ApplicationFiled: September 11, 2001Publication date: May 30, 2002Inventors: Bernardus Antonius Maria Oude Alink, Vladimir Jovancicevic
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Patent number: 6391257Abstract: This invention relates to antifreeze compositions comprising a mixture of organic acid corrosion inhibitors. The compositions comprise (a) from about 90% to about 99.89% by weight of a liquid alcohol which functions as a freezing point depressant, or mixture thereof; (b) from about 0.1% to about 5.5% by weight of a carboxylic acid selected from the group consisting of saturated and unsaturated aliphatic, and aromatic, mono-, di- and tri-carboxylic acids, and salts and isomers thereof, and any mixture thereof, and (c) from about 0.1% to about 2% by weight of a cyclohexenoic acid, or salt, isomer or mixture thereof, having the formula: wherein each of R1, R2 and R3 is, independently, selected from the group consisting of H, OH, COOH, C1-C10 alkyl groups, glycol esters, or combinations thereof.Type: GrantFiled: August 19, 1998Date of Patent: May 21, 2002Assignee: Prestone Products CorporationInventor: Peter M. Woyciesjes
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Patent number: 6372918Abstract: The invention relates to compounds of the formula 1 R1—O—(A—O)x—(CH2)y—R2 (1) in which R1 is branched or straight-chain C4-C30-alkyl, C4-C30-alkenyl or C4-C30-alkylaryl, A is C2-C4-alkylene, x is an integer from 1 to 100, y is 1, 2, 3 or 4 and R2 is a radical selected from structures of the formulae 2 and 3 —CO—NR3R4 (2) in which one of the radicals R3 and R4 is a hydrocarbon chain which has at least one free NH or NH2 group and the other radical is hydrogen or a hydrocarbon chain which has at least one free NH or NH2 group and R5 is hydrogen or a hydrocarbon chain which has at least one free NH or NH2 group.Type: GrantFiled: June 30, 2000Date of Patent: April 16, 2002Assignee: Clariant GmbHInventors: Michael Feustel, Peter Klug
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Patent number: 6362137Abstract: This invention relates to a cost effective process for preparing a corrosion inhibitor/metal passivator additive for lubricant, grease and fuel applications from waste refinery streams, comprising reacting 2,5-dimercapto-1,3,4-thiadiazole either in powder form or in solution form in polar organic solvent, with disulphide oil obtained from Merox extraction/caustic wash of the refinery streams, in the presence or absence of redox agent.Type: GrantFiled: August 17, 2000Date of Patent: March 26, 2002Assignee: Indian Oil CorporationInventors: Akhilesh Bhatnagar, Deepak Kumar Tuli, Rakesh Sarin, Ajay Arora, Pankaj Kumar Mandal
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Patent number: 6350395Abstract: A stabilizer composition comprising a) an N-alkyl morpholine and b) a straight-chain or cyclic aliphatic amine containing no hetroatoms other than N with a boiling point of at least 150° C. The stabilizer composition is useful for stabilizing a halogenated hydrocarbon against degradation.Type: GrantFiled: June 16, 2000Date of Patent: February 26, 2002Assignee: The Dow Chemical CompanyInventor: Marius Kuemin
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Patent number: 6340438Abstract: A corrosion inhibiting admixture for concrete is disclosed comprising a combination of organic (amines) and inorganic (nitrites) fractions that provide a synergistic effect when present at a specific ratio. Such a synergistic effect occurs when the amine:nitrite ratio (% by weight) is between 1.5 to 2.5 resulting in the admixture providing excellent corrosion inhibiting capabilities.Type: GrantFiled: April 19, 1999Date of Patent: January 22, 2002Assignee: Tomahawk, Inc.Inventors: Donald R. Lane, Jose A. Melendez, Violeta F. Munteanu, Frederick D. Kinney
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Patent number: 6306201Abstract: This invention relates to a bivalent iron compound comprising a bivalent iron salt, an amino acid and a reducing material. It is known that bivalent iron salts exhibit specific effects in wide applications, for example, agricultural applications such as modification of soil quality, fishing applications such as quality preservation of fishes, medical applications such as treatment of diseases and industrial applications such as prevention of metal corrosion and purification of waste water and exhaust gas. However, the conventional bivalent iron salts suffer a problem that they cannot exhibit such effect for extended periods. This invention was successful in chemically stabilizing the bivalent iron salts by adding amino acids and reducing materials so as to sustain the effects inherent in the bivalent iron salts and to enable utilization thereof in industrial applications.Type: GrantFiled: June 7, 1999Date of Patent: October 23, 2001Assignee: I.B.E. Company, Ltd.Inventor: Shinzi Makino
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Patent number: 6303079Abstract: The present invention relates to a process for making and a method for using a corrosion inhibitor composition to reduce the corrosion rate of a metal by a fluid containing a corrosion agent. The corrosion inhibitor composition comprises at least a quaternized compound having an amido moiety. An example of the quaternized compound is a quaternized amido imidazoline.Type: GrantFiled: March 15, 1999Date of Patent: October 16, 2001Assignee: Nalco/Exxon Energy Chemicals, L.P.Inventor: George Richard Meyer
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Patent number: 6299836Abstract: Corrosion in aqueous alkanolamine, physical solvents, or combination of alkanolamine and physical solvent solutions used to remove acid gases from natural gas, synthetic gas, or light hydrocarbon streams can be reduced by addition of mixtures of oxygen scavengers or mixtures of oxygen scavengers and sodium molybdate. The oxygen scavengers must be promoted to reduce metal surfaces in contact with the solutions to a more passive, harder, and insoluble form at the operating temperature of the treating system. The sodium molybdate provides additional passivation especially in the imperfections on the surface of the metal where corrosion accelerates.Type: GrantFiled: October 14, 1998Date of Patent: October 9, 2001Assignee: Coastal Chemical Co., L.L.C. (A Louisiana limited liability company)Inventors: Ray R. Veldman, David O. Trahan
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Publication number: 20010011515Abstract: An anticorrosive agent containing, as essential components, (a) urea or a urea derivative and (b) a hydroxy aromatic compound.Type: ApplicationFiled: January 25, 2001Publication date: August 9, 2001Applicant: NEC CorporationInventors: Hidemitsu Aoki, Tatsuya Koito, Kenichi Nakabeppu
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Patent number: 6261346Abstract: A process useful for protecting metal surfaces against corrosion in is presented involving: (a) forming a corrosion inhibitor having a compound corresponding to formula (I): where R1, R2 and R3 independently of one another represent an alkyl or hydroxyalkyl group containing 1 to 4 carbon atoms, an aryl or alkylaryl group or a group corresponding to formula (II): A− is an anion, n is the number 2 or 3, p is a number of 1 to 3 and R5 is an alkyl or alkenyl group containing 7 to 23 carbon atoms and 0, 1, 2 or 3 double bonds, and R4 is a group corresponding to formula (II) or (III): where R1, R2 and R3 are as defined above and Z is a group —(CH2)m— or a group corresponding to formula (IV): m is an integer of 1 to 6, X is a group NH or an oxygen atom and D is a dimer fatty acid residue containing on average 36 to 54 carbon atoms; (b) combining the corrosion inhibitor with liquid aqueous, liquid non-aqueous or gaseous meType: GrantFiled: July 29, 1999Date of Patent: July 17, 2001Assignee: Cognis Deutschland GmbHInventors: Wolfgang Breuer, Robert Schuetz, Guenther Uphues, Claus-Peter Herold, Rafael Pi
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Patent number: 6238621Abstract: There are disclosed corrosion inhibiting compositions comprising (a) at least one amido acid or salt thereof and (b) at least one of an aryltriazole or 3-amino-1,2,4-triazole wherein the molar ratio of (a) to (b) is about 0.34:1 to about 5:1, and aqueous metal working fluids containing the corrosion inhibiting compositions of the invention.Type: GrantFiled: May 25, 1999Date of Patent: May 29, 2001Assignee: Solutia Inc.Inventors: Dennis J. Kalota, Yueting Chou, David C. Silverman
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Patent number: 6180057Abstract: Corrosion inhibiting compositions and methods for inhibiting the corrosion of metal surfaces by corrosive aqueous fluids are provided. In accordance with the invention, a corrosion inhibiting composition comprised of one or more aldehyde oligomers having the general formula are combined with the corrosive aqueous fluid.Type: GrantFiled: June 19, 1998Date of Patent: January 30, 2001Assignees: Nalco/Exxon Energy Chemicals L.P., Halliburton Energy Services, Inc.Inventors: Grahame N. Taylor, Juanita M. Cassidy, Dennis A. Williams, Gary P. Funkhouser
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Patent number: 6176907Abstract: Formulation for anti-corrosion coating materials, comprising (i) 3-30% by mass of a monomeric and/or polymeric, metal-free or metal-containing, chelate-forming compound, (ii) 10-80% by mass of a material which binds hydroxide ions, and (iii) 5-65% by mass of a conductive pigment based on carbon.Type: GrantFiled: January 19, 1999Date of Patent: January 23, 2001Assignee: Merck Patent Gesellschaft mit beschrankter HaftungInventor: Ralf Glausch
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Patent number: 6171521Abstract: This invention is directed to a zwitterionic water-soluble imine of formula: wherein R1 is heterocyclyl, heteroaryl, aryl, arylalkyl, cycloalkyl or lower alkyl; R2 is alkyl, alkenyl, aminoalkyl, diaminoalkyl, hydroxyalkyl, alkoxyalkyl, thioalkyl, alkylthioalkyl or arylalkyl; R3 is hydrogen and lower alkyl, or R1 and R3 taken together form a cycloalkyl, p is 2, 3, 4 or 5; and Z is CO2−, OCO2−, SO3−, OSO3−, PO3− or OPO3− which are useful as ferrous metal corrosion inhibitors.Type: GrantFiled: September 22, 1999Date of Patent: January 9, 2001Assignee: Nalco/Exxon Energy Chemicals, L.P.Inventor: G. Richard Meyer
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Patent number: 6103144Abstract: Non-halogen substituted, nitrogen containing, aromatic compounds are disclosed which are effective copper corrosion inhibitors in aqueous systems being treated with a halogen biocide. The materials of the present invention exhibit copper corrosion inhibition comparable to tolyltriazole in the absence of halogen, copper corrosion rates of less than about 2.5 mills per year in aqueous systems where halogen is present; and do not exhibit a detrimental effect on halogen demand in an aqueous system being treated.Type: GrantFiled: April 12, 1999Date of Patent: August 15, 2000Assignee: BetzDearborn Inc.Inventor: Longchun Cheng
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Patent number: 6059992Abstract: Corrosion in aqueous alkanolamine, physical solvents, or combination of alkanolamine and physical solvent solutions used to remove acid gases from natural gas, synthetic gas, or light hydrocarbon streams can be reduced by addition of mixtures of oxygen scavengers or mixtures of oxygen scavengers and sodium molybdate. The oxygen scavengers must be promoted to reduce metal surfaces in contact with the solutions to a more passive, harder, and insoluble form at the operating temperature of the treating system. The sodium molybdate provides additional passivation especially in the imperfections on the surface of the metal where corrosion accelerates.Type: GrantFiled: October 14, 1997Date of Patent: May 9, 2000Inventors: Ray R. Veldman, David O. Trahan
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Patent number: 6056896Abstract: The present invention provides an improved metal corrosion inhibitor for use in aqueous acid solutions which is relatively non-toxic and inexpensive. The corrosion inhibitor is a mixture comprised of oligomerized aromatic amines prepared by contacting the still bottoms residue produced in the distillation of quinoline from coal tar with oxygen in the presence of a catalyst.Type: GrantFiled: May 28, 1998Date of Patent: May 2, 2000Assignee: Halliburton Energy Services, Inc.Inventor: Michael M. Brezinski
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Patent number: 6045719Abstract: Quaternized imidazoles I ##STR1## in which R.sup.1 and R.sup.3 independently of one another are saturated or unsaturated hydrocarbon radicals of 1-12 carbon atoms which can be substituted by oxygen-functional groups or interrupted by nonadjacent oxygens,R.sup.2, R.sup.4 and R.sup.5 independently of one another are hydrogen or saturated or unsaturated hydrocarbon radicals of 1-12 carbon atoms which can be substituted by oxygen-functional groups or interrupted by nonadjacent oxygens, it being possible for R.sup.4 and R.sup.5, together with the corresponding imidazole carbons, to form a five- or six-membered ring, andX.sup..crclbar. is an anion,are used as corrosion inhibitors in the corrosion protection of nonferrous metals, especially for car radiator protection.Type: GrantFiled: August 11, 1998Date of Patent: April 4, 2000Assignee: BASF AktiengesellschaftInventors: Ladislaus Meszaros, Michael Gillich, Klaus Pfitzner, Knut Oppenlander, Wolfgang Gunther
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Patent number: 6045723Abstract: The subject matter of this invention is directed to compositions and compounds to minimize hydrogen charging and hydrogen induced cracking of steels comprising, in one embodiment, a propylene diamine compound and in another a carrier and propylene diamines. Preferably, the composition of that embodiment is comprised of a hydrocarbon carrier and 1,3 propylene diamines. Alternatively, compositions of the present invention may be comprised of a carrier and octadecyl trimethyl ammonium bromide. In addition, where the environment dictates, the composition of the present invention may be comprised of a carrier, at least one 1,3 propylene diamine and octadecyl trimethyl ammonium bromide.Type: GrantFiled: October 29, 1998Date of Patent: April 4, 2000Inventors: Russell D. Kane, Michael S. Cayard
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Patent number: 6042750Abstract: A composition for inhibiting corrosion of metal is described, wherein the composition comprises at least one tetraalkylammonium halide, at least one alkyldiamine, at least one polyethylene aliphatic hydrocarbon amine, at least one polyethylene fatty acid ester, at least one aliphatic hydrocarbon hydroxyalkyl imidazoline, at least one polyethylene glycol aliphatic ester, and at least one trialkanolamine, and at least one amine oxyalkylate.Type: GrantFiled: April 17, 1999Date of Patent: March 28, 2000Assignee: Joan DocterInventor: James O. Burlew
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Patent number: 6022401Abstract: Several copolymers of aspartic acid and another monomer provide effective mild steel corrosion inhibitors and scale formation inhibitors under oil field conditions. The copolymers are polymers of modified polyaspartic acid mer units and polyaspartic acid mer units. The resulting polymers are biodegradable.Type: GrantFiled: April 17, 1998Date of Patent: February 8, 2000Assignee: Nalco Chemical CompanyInventors: Jiansheng Tang, Shi-Liang Fu, Daniel H. Emmons
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Patent number: 5993693Abstract: Zwitterionic water-soluble imine corrosion inhibitors of the general formula: ##STR1## wherein R.sup.3 is an anionically charged group. Preferred zwitterionic imines are the reaction products of the Michael addition of acrylic acid to an imine.Type: GrantFiled: November 9, 1998Date of Patent: November 30, 1999Assignee: Nalco/Exxon Energy Chemicals, L.P.Inventor: G. Richard Meyer
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Patent number: 5989440Abstract: An oxygen scavenger characterized in that the effective component thereof consists of a heterocyclic compound with N--N bond in a ring thereof An oxygen scavenger characterized in that the effective component thereof consists of a heterocyclic compound with N-substituted amino group. An oxygen scavenger characterized in that the effective component thereof consists of a heterocyclic compound represented by the following formula: ##STR1## (wherein a, b are integers between 0 and 5 to satisfy a relation "2.ltoreq.a+b.ltoreq.5"). ##STR2## An oxygen scavenger characterized in that the effective component thereof consists of azodicarbonamide. An oxygen scavenger characterized by including a heterocyclic compound with N-substituted amino group, or the salt thereof, and a hydroxybenzene derivative. Those may contain further neutral amine, alkalic agent and/or water soluble polymer.Type: GrantFiled: November 20, 1997Date of Patent: November 23, 1999Assignee: Kurita Water Industries Ltd.Inventors: Yukimasa Shimura, Shiro Taya
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Patent number: 5980619Abstract: A description is given of compounds of the formula ##STR1## in which the general symbols are as defined in claim 1, and of their zirconium, bismuth and calcium salts, and of the salts with the compounds of the formula II ##STR2## in which the general symbols are as defined in claim 1, as corrosion inhibitors in coating compositions for protecting metallic surfaces.Type: GrantFiled: February 12, 1997Date of Patent: November 9, 1999Assignee: Ciba Specialty Chemicals CorporationInventors: Adalbert Braig, Andreas Kramer, Jean-Pierre Wolf, Markus Frey
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Patent number: 5968408Abstract: The use of halo-benzotriazoles as corrosion inhibitors in aqueous systems is disclosed. Specific isomers of chloro-methylbenzotriazole were found to be more effective corrosion inhibitors than tolyltriazole in the presence of chlorine.Type: GrantFiled: June 24, 1998Date of Patent: October 19, 1999Assignee: BetzDearborn Inc.Inventors: Sydia B. Anderson, Longchun Cheng, Michael A. Cady
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Patent number: 5961885Abstract: A corrosion inhibitor comprising a dispersant, an imidazoline, an amide, an alkyl pyridine and a heavy aromatic solvent. The resultant blend effectively inhibits corrosion of flow lines containing low pH mixtures of hydrocarbons, water, and acid gases.Type: GrantFiled: January 12, 1999Date of Patent: October 5, 1999Assignee: Champion Technologies, Inc.Inventors: Paul Eaton, Sumeet Kanwar
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Patent number: 5916484Abstract: By the present invention, improved metal corrosion inhibited aqueous organic acid compositions and methods are provided. The compositions are basically comprised of water, an organic acid, a corrosion inhibitor comprising at least one rosin amine derivative and a low toxicity corrosion inhibitor intensifier selected from the group consisting of thioglycolic acid and derivatives thereof.Type: GrantFiled: May 13, 1997Date of Patent: June 29, 1999Assignee: Halliburton Energy Services, Inc.Inventor: Michael M. Brezinski
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Patent number: 5902515Abstract: A corrosion inhibitor comprising a dispersant, an imidazoline, an amide, an alkyl pyridine and a heavy aromatic solvent. The resultant blend effectively inhibits corrosion of flow lines containing low pH mixtures of hydrocarbons, water, and acid gases.Type: GrantFiled: August 16, 1995Date of Patent: May 11, 1999Assignee: Champion Technologies, Inc.Inventors: Sumeet Kanwar, Paul Eaton
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Patent number: 5900256Abstract: An aqueous acidic disinfecting and sterilizing composition for medical instruments, which may include brass, copper, aluminum, stainless steel, plastic and ceramic components. The composition contains hydrogen peroxide, peracetic acid, a corrosion inhibitor system, a surfactant and a stabilizer. These compositions have in use stability and are effective as a disinfectant and/or sterilant either at room or when heated. For other applications, surfactants, sequestering agents and stabilizers may be optional.Type: GrantFiled: February 17, 1998Date of Patent: May 4, 1999Assignee: Cottrell, Ltd.Inventors: John R. Scoville, Jr., Inna A. Novicova
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Patent number: 5891364Abstract: Compositions and methods relating to cementitious compositions are provided. The addition of an amidoamine that is the reaction product of polyalkylenepolyamines and short-chain alkanedioic acids or reactive derivatives thereof to cementitious compositions has been found useful in inhibiting the corrosion of ferrous metal articles in contact with said composition. The amidoamine is advantageously employed in combination with a hydrophobe compound that enhances corrosion inhibition. The invention also provides aqueous emulsions which contain the amidoamine, one or more hydrophobes, and an emulsifier for the hydrophobe.Type: GrantFiled: July 9, 1996Date of Patent: April 6, 1999Assignee: Geo Specialty Chemicals, Inc.Inventors: Michael J. Incorvia, Jr., Robert W. Chobin, Jr., Tim Hegge, Jr.
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Patent number: 5874026Abstract: A method of use of a composition including either or both isomers of hydrogenated methylbenzotriazole, namely, 5-Methyl-1H-Benzotriazole or 4-Methyl-1H-Benzotriazole which have been at least about 50% hydrogenated, to form corrosion inhibiting films on metal surfaces in an aqueous environment. The hydrogenated methylbenzotriazole compositions provide both improved passivation and improved film persistence when charged to aqueous industrial systems either on a continuous or on an intermittent basis. Continuous dosing is generally kept at a constant >0.5, typically 1-2 ppm in the aqueous system to be treated; intermittent doses are generally 10-20 ppm once every week or two or more.Type: GrantFiled: December 1, 1997Date of Patent: February 23, 1999Assignee: Calgon CorporationInventors: John P. Pilsits, Jr., Ann M. Cognetti, Jasbir S. Gill
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Patent number: 5871691Abstract: A method and compounds for inhibiting and controlling corrosion is disclosed. The method is particularly effective at inhibiting or preventing corrosion of ferrous-based metals in contact with aqueous systems such as cooling water systems. The method comprises introducing into the aqueous system a compound of the general formula: ##STR1## wherein R is hydrogen, alkyl, aryl, substituted alkyl or substituted aryl; R' and R" are each independently hydrogen, C.sub.1-4 alkyl or C.sub.1-4 substituted alkyl; Z is O, S, NH, or NR, where R is as described above; n is a positive integer greater than 1; f is a positive integer; and M is hydrogen, a water soluble cation (e.g., NH.sub.4.sup.+, alkali metal), or a C.sub.1 -C.sub.3 alkyl group.Type: GrantFiled: September 27, 1995Date of Patent: February 16, 1999Assignee: BetzDearborn Inc.Inventors: William S. Carey, William C. Ehrhardt, Andrew Solov
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Patent number: 5866032Abstract: A composition for of controlling scale formation and deposition and corrosion in aqueous systems is described wherein a treatment solution of a substoichiometric amount of a composition comprising a scale/corrosion inhibitor in combination with a substituted alkylpolycarboxylate is employed. The scale/corrosion inhibitor can be a phosphonate such as hydroxyethylidene diphosphonic acid, 2-phosphonobutane-1,2,4-tricarboxylic acid, hydroxyphosphonoacetic acids, amino phosphonates; terpolymers, copolymers and homopolymers of acrylic acid, maleic acid, epoxysuccinic acids such as polyepoxysuccinic acid or mixtures thereof. The substituted alkylpolycarboxylates are compounds of the general structure: R--X.sub.m --Y.sub.n wherein R is a hydrocarbon functionality having 4 to 18 carbons; X, when present, is --NH--, --NY.sup.1 --, --N-->O, --N--OC--Y.sup.1, --O-- or --S--; n is greater than or equal to 1; m=O or 1; and Y and Y.sup.Type: GrantFiled: November 18, 1997Date of Patent: February 2, 1999Assignee: BetzDearborn Inc.Inventors: William S. Carey, Libardo A. Perez, Donald T. Freese, Judith L. Barron
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Patent number: 5863611Abstract: A lead-free composition capable of being applied as a film and hardening to form a protective layer on the back of a mirror comprises a fluid organic resin and a corrosion inhibitor selected from a compound represented by the formula: ##STR1## wherein the individual radicals R.sup.1, R.sup.2, R.sup.3 and R.sup.4 can be identical or different and are each hydrogen, an aliphatic, cycloaliphatic, araliphatic or aromatic radical, and can be substituted or unsubstituted; A is hydrogen or C.sub.z --CR.sup.5 R.sup.6 CN; X, Y and Z are independently selected from 0-5; and R.sup.5 and R.sup.6 are as defined for R.sup.1, R.sup.2, R.sup.3 and R.sup.4 above. To inhibit the corrosion of metallic film layers on mirrors, a mirror having a glass substrate layer and metallic film layer thereover should be obtained, after which the fluid organic resin coating system containing the aforementioned corrosion inhibitor is applied over the metallic film layer.Type: GrantFiled: May 27, 1997Date of Patent: January 26, 1999Assignee: Lilly Industries (USA), Inc.Inventor: Timothy J. Sanford
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Patent number: 5863463Abstract: The use of halo-benzotriazoles as corrosion inhibitors in aqueous systems is disclosed. Halo-benzotriazoles such as chloro-tolyltriazole and bromo-tolyltriazole were found to be more effective corrosion inhibitors than tolyltriazole in the presence of chlorine.Type: GrantFiled: February 27, 1998Date of Patent: January 26, 1999Assignee: BetzDearborn Inc.Inventors: David W. Reichgott, Sydia B. Anderson, Michael A. Cady, Roger C. May, Anita G. Monino
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Patent number: 5863464Abstract: The use of halo-benzotriazoles as corrosion inhibitors in aqueous systems is disclosed. Halo-benzotriazoles such as chloro-tolyltriazole and bromo-tolyltriazole were found to be more effective corrosion inhibitors than tolyltriazole in the presence of chlorine.Type: GrantFiled: June 10, 1998Date of Patent: January 26, 1999Assignee: BetzDearborn Inc.Inventors: David W. Reichgott, Sydia B. Anderson, Michael A. Cady, Roger C. May, Anita G. Monino
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Patent number: 5853619Abstract: A low toxic corrosion inhibitor comprises (A) mercaptocarboxylic acid having from 2 to 6 carbon atoms, and (B) a polyamine/fatty acid/carboxylic acid adduct. The preferred combination of (A) and (B) includes mercaptoacetic acid and ethylenetetramine/tall oil acd/acrylic acid adduct.Type: GrantFiled: November 22, 1996Date of Patent: December 29, 1998Assignee: Nalco/Exxon Energy Chemicals, L.P.Inventors: James D. Watson, John G. Garcia, Jr.
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Patent number: 5853620Abstract: The subject matter of this invention is directed to compositions and compounds to minimize hydrogen charging and hydrogen induced cracking of steels comprising, in one embodiment, a propylene diamine compound and in another a carrier and propylene diamines. Preferably, the composition of that embodiment is comprised of a hydrocarbon carrier and 1,3 propylene diamines. Alternatively, compositions of the present invention may be comprised of a carrier and octadecyl trimethyl ammonium bromide. In addition, where the environment dictates, the composition of the present invention may be comprised of a carrier, at least one 1,3 propylene diamine and octadecyl trimethyl ammonium bromide.Type: GrantFiled: February 28, 1995Date of Patent: December 29, 1998Assignee: InterCorr-CLI International, Inc.Inventors: Russell D. Kane, Michael S. Cayard
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Patent number: 5811026Abstract: A method of inhibiting corrosion and the formation of hydrogen and thus improving absorption in an ammonia/water absorption refrigeration, air conditioning or heat pump system by maintaining the hydroxyl ion concentration of the aqueous ammonia working fluid within a selected range under anaerobic conditions at temperatures up to 425.degree. F. This hydroxyl ion concentration is maintained by introducing to the aqueous ammonia working fluid an inhibitor in an amount effective to produce a hydroxyl ion concentration corresponding to a normality of the inhibitor relative to the water content ranging from about 0.015 N to about 0.2 N at 25.degree. C. Also, working fluids for inhibiting the corrosion of carbon steel and resulting hydrogen formation and improving absorption in an ammonia/water absorption system under anaerobic conditions at up to 425.degree. F. The working fluids may be aqueous solutions of ammonia and a strong base or aqueous solutions of ammonia, a strong base, and a specified buffer.Type: GrantFiled: August 14, 1996Date of Patent: September 22, 1998Assignee: Phillips Engineering CompanyInventors: Benjamin A. Phillips, Eugene P. Whitlow
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Patent number: 5811032Abstract: A water-soluble polymer prepared by melting and reacting a mixture of an oxycarboxylic acid having a melting point of 170.degree. C. or less and maleamic acid, or a mixture of a plurality of oxycarboxylic acids including at least one oxycarboxylic acid having a melting point of 170.degree. C. or less and maleamic acid, at a temperature of 170.degree. C. or less at the start of the reaction to obtain a polymer; and then hydrolyzing the polymer.Type: GrantFiled: September 19, 1996Date of Patent: September 22, 1998Assignee: Mitsubishi Gas Chemical Company, Inc.Inventors: Ryozo Kawai, Hiroshi Kurata, Yukari Shimizu, Shoichiro Kajiwara
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Patent number: 5785896Abstract: A method of combating corrosion of a metal which comprises contacting such metal with a composition containing polyamino acids, their salts and their anhydrides, together with at least one corrosion inhibitor selected from the group consisting of benzotriazole, 4-C.sub.1 -C.sub.4 -alkylbenzotriazoles and 5-C.sub.1 -C.sub.4 -alkylbenzotriazoles.Type: GrantFiled: October 31, 1995Date of Patent: July 28, 1998Assignee: Bayer AktiengesellschaftInventors: Heinz-Joachim Rother, Franz Kunisch
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Patent number: 5785895Abstract: A method for inhibiting corrosion in an aqueous medium is disclosed. The method comprises incorporating into the medium an amount of a water-soluble corrosion inhibitor sufficient to inhibit corrosion. The corrosion inhibitor comprises an N-ethoxy, 2-substituted imidazoline, the N-ethoxy substituent having from one to about thirty ethoxy units and the 2-substituent being an unsaturated or polyunsaturated fatty chain of from about six to about thirty carbons. If the medium is sweet, the inhibitor further comprises a phosphate ester derived from a water-soluble oxyethylated, straight chain alcohol of from about two to about thirty carbons. Corrosion inhibitor compositions useful in such method are also disclosed.Type: GrantFiled: December 6, 1995Date of Patent: July 28, 1998Assignee: Petrolite CorporationInventors: Richard L. Martin, Jo Ann McMahon, Bernardus A. Oude Alink
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Patent number: RE36291Abstract: A method for inhibiting corrosion of metal surfaces in an aqueous medium, comprising incorporating into the medium a corrosion inhibitor in an amount sufficient to inhibit corrosion, the corrosion inhibitor comprising a water-soluble agent selected from the group consisting of compositions of the formula ##STR1## compositions of the formula ##STR2## and mixtures thereof, wherein R is R.sup.2 .paren open-st.OCH.sub.2 CH.sub.2 .paren close-st..sub.x, wherein R.sup.2 is a substituted or unsubstituted alkyl, aryl, or aralkyl group of from about five to about fifteen carbon atoms, each carbon atom having at least one hydrogen and x is an integer of from about one to about ten, and R'N is a basic nitrogen compound that is at least water-dispersible.Type: GrantFiled: December 12, 1995Date of Patent: September 7, 1999Assignee: Baker Hughes IncorporatedInventor: Richard L. Martin